Pyrometer



Dec. 7, 1943.

A. W. DIACK PYROMETER Filed July 31, 1941 2O IO 25 gmmamms a v INVENTOR.

By ARCHIIALD WDIACK ATTORNEYS Patented Dec. 7, 1943 UNITED STATES PATENT OFFICE.

PYROIMETER Archibald W. Diack, Ann Arbor, Mich.

Application July 31, 1941, Serial No. 404,803

1 Claim.

The present invention relates specifically to means for indicating temperatures, though in its broader aspects, is applicable to other articles.

In my prior Patent No. 1,000,673, dated August 15, 1911, there is shown a device used for the purpose of indicating the temperature and time attained in articles or chambers and more especially designed for use in sterilizing rolls of surgical dressings. This device consists of a sealed glass tube containing a small pellet of material having a melting point of the desired degree and designed to be placed in the center of an article to be sterilized. After a suitable time of heating, the tube is withdrawn by means of the attached cord and if the pellet is seen to have melted, the attendant knows that a sterilizing temperature and time has been attained.

However, in the production and use of the device, difiiculty is sometimes experienced in withdrawing the tube from the dressings.

The chief object of the present invention is to overcome this difficulty and provide means to enable easy withdrawing of the device.

Another object is means to prevent the perforation of and possible injury to the dressing by the device.

Other objects and advantages will be apparent to those skilled in the art upon reference to the following description and the accompanying drawing in which Figure 1 is a perspective view of the pyrometer with a withdrawal shield spaced therefrom.

Figure 2 is a pyrometer with a shield in position.

Figures 3 and 4 are respectively a plan and side elevation of a shield.

Figure 5 is a sectional view of a roll of dressing with the pyrometer in place therein.

In the drawing, the pyrometer tube It], of glass, is shown as containing a suitable pellet ll and so formed at one end as to provide a neck [2 about which is tied a suitable cord l3. Sealing this end of tube ID to provide the neck I2, necessarily results in a head I 4, which, when withdrawing the device, tends to rotate the tube l0 endwise and to hang in the surrounding dressing material 20. In order to prevent such action, it is proposed to apply a cup-shaped shield such as shown at 25.

This shield may consist of any suitable material, but is preferably a small piece of a stiff paper unaffected by a sterilizing heat and preferably is circular. The shield may be a flat piece or it may be pre-crimped, as indicated in Figure 4, and is provided with an opening 26 through which may pass the cord I3.

When pre-criinping is done, the shield 25 may be cut radially as at 2'! to facilitate placing on the cord, and in such case, lapping of the edges in producing the conical form will maintain the shield against displacement. However, the radial cut 21 and central opening may be omitted in preparing the shield if it is desired to thrust the cord through with a suitable tool.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive; reference being had to the appended claim rather than to the foregoing description to indicate the scope of the invention.

I claim:

The combination with a pyrometer consisting of a sealed tubular member containing a fusible element, said tubular member having a neck portion adjacent one end and a cord secured to the neck portion by means of which said tubular member may be withdrawn from a roll of surgical dressing, of shield means consisting of a cup of thin relatively stiff material having an opening in the bottom thereof for the passage of said cord, said cup surrounding said cord and with its open side toward said pyrometer.

ARCHIBALD W. DIACK. 

